package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIDWorker {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 初始时间戳
     */
    private static final long BEGIN_TIMESTAMP=1735689600L;
    /**
     * 序列号的位数
     */
    private static final int COUNT_BITS=32;

    public long nextId(String prefix){
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp=nowSecond-BEGIN_TIMESTAMP;
        // 2.生成序列号
        // 2.1.获取当前日期，精确到天
        String date = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 2.2.自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + prefix + ":" + date);
        // 3.拼接
        return timestamp<<COUNT_BITS | count;
    }

    /*public static void main(String[] args) {
        LocalDateTime localDateTime = LocalDateTime.of(2025, 1, 1, 0, 0);
        long epochSecond = localDateTime.toEpochSecond(ZoneOffset.UTC);
        System.out.println(epochSecond);
    }*/
}
